From: Eric Sandeen <sandeen@redhat.com>
To: xfs-oss <xfs@oss.sgi.com>
Subject: [PATCH] xfs: catch invalid negative blknos in _xfs_buf_find()
Date: Wed, 19 Nov 2014 16:12:51 -0600 [thread overview]
Message-ID: <546D15E3.5000200@redhat.com> (raw)
Here blkno is a daddr_t, which is a __s64; it's possible to hold
a value which is negative, and thus pass the (blkno >= eofs)
test. Then we try to do a xfs_perag_get() for a ridiculous
agno via xfs_daddr_to_agno(), and bad things happen when that
fails, and returns a null pag which is dereferenced shortly
thereafter.
Found via a user-supplied fuzzed image...
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 24b4ebe..f54a497 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -463,7 +463,7 @@ _xfs_buf_find(
* have to check that the buffer falls within the filesystem bounds.
*/
eofs = XFS_FSB_TO_BB(btp->bt_mount, btp->bt_mount->m_sb.sb_dblocks);
- if (blkno >= eofs) {
+ if (blkno < 0 || blkno >= eofs) {
/*
* XXX (dgc): we should really be returning -EFSCORRUPTED here,
* but none of the higher level infrastructure supports
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next reply other threads:[~2014-11-19 22:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-19 22:12 Eric Sandeen [this message]
2014-11-19 22:27 ` [PATCH] xfs: catch invalid negative blknos in _xfs_buf_find() Eric Sandeen
2014-11-26 15:58 ` Eric Sandeen
2014-11-26 16:38 ` Mark Tinguely
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